Why One leg has turned blue?

PASHA bhai’s one leg had turned blue..
He went to the doctor..

Doctor: “poison has spread pasha bhai. The leg needs to be amputated..”

Operation took place and pasha bhai’s one leg was removed.

After few days, another leg turned blue.

Doctor: “poison has widely spread. We need to amputate this leg too..”

Now pasha bhai had two artificial legs fixed.

After few days, artificial leg turned blue too..

Doctor: now I understand your problem. Pasha bhai, your lungi is leaving color…